Checks if x is a function.
check_function(x, nargs = NA, x_name = substitute(x), error = TRUE)The object to check.
A count of the number of arguments or count range of the minimum and maximum number of arguments.
A string of the name of the object x.
A flag indicating whether to throw an informative error or immediately generate an informative message if the check fails.
An invisible copy of x (if it doesn't throw an error).
check_function(character, error = FALSE)
#> Warning: `check_function()` was deprecated in checkr 0.5.1.
#> Please use `chk::chk_function()` instead.
check_function(character, nargs = 0L, error = FALSE)
#> Warning: `check_function()` was deprecated in checkr 0.5.1.
#> Please use `chk::chk_function()` instead.
#> Warning: character must have 0 arguments